If a first-level of reliability and non-accidentality is inadequate to achieve genuinely human knowledge, why does an added layer of the same deficient stuff turn low-grade knowledge into high-grade knowledge?

In more familiar terminology, animal knowledge is reliably and non-accidentally true belief whereas reflective knowledge features an additional “layer” of reliably and non-accidentally caused true belief, true belief about the reliability and non-accidentality of the first-order belief.

The world is not to be understood as a complex of ready - made things, but as a complex of processes, in which the things apparently stable, no less than their mental images in our heads (Gedankenabbilder), the concepts, go through an uninterrupted change of coming into being and passing away, in which despite all seeming accidentality and tem porary retrogression, a progressive development asserts itself in the end